hydac accumulators product catalogue

Global presence.Local expertise.www.hydac.com

HYDAC HeadquartersHYDAC CompaniesHYDAC Distributors and Service Partners

HYDAC TECHNOLOGY GMBH

Industriegebiet 66280 Sulzbach/Saar GermanyPhone: +49 (0) 6897 509-01Fax: +49 (0) 6897 509-464Internet: www.hydac.com E-Mail: [email protected]

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1. HYDAC ACCUMULATOR TECHNOLOGY FLUID ENGINEERING EFFICIENCY THROUGH ENERGY MANAGEMENT.

HYDAC Accumulator Technology has over 45 years' experience in research & development, design and production of Hydac accumulators.Bladder, piston, diaphragm and metal bellows accumulators from HYDAC together form an unbeatable range and as components or units, support hydraulic systems in almost all sectors.

The main applications of our accumulators are:

zEnergy storage, zEmergency and safety functions, zDamping of vibrations, fluctuations, pulsations (pulsation damper), shocks (shock absorber) and noise (silencer), zSuction flow stabilisation, zMedia separation, zVolume and leakage oil adjustment, zWeight equalization, zEnergy recovery.

Using accumulators improves the performance of the whole system and in detail this has the following benefits:

z Improvement in the functions z Increase in service life zReduction in operating and maintenance costs zReduction in pulsations and noise

On the one hand, this means greater safety and comfort for operator and machine.On the other hand, HYDAC accumulators enable efficient working in all applications.

Basic criteria, such as: zDesign pressure, zDesign temperature, z Fluid displacement volume, zDischarge / Charging velocity, z Fluid, zAcceptance specifications and also zMounting options

are important parameters required for sizing the correct accumulator. In addition the knowledge developed by our accumulator specialists will help to select the right type of accumulator. The comprehensive range of HYDAC accessories simplifies installation and maintenance according to the specification.

2. QUALITYQuality, safety and reliability are paramount for all HYDAC accumulator components.They comply with the current regulations (or standards) for pressure vessels in the individual countries of installation.In taking delivery of a HYDAC Hydraulic Accumulator therefore, the customer is assured of a high-quality accumulator product which can be used in every country in the world, depending on the certification.For more details, please turn to Section 4.

All the processes involved, from development, engineering and production to approval and delivery are defined by HYDAC's certified management system and the relevant international accreditation for the manufacture of pressure vessels.

In conjunction with the customer service department at HYDAC's headquarters, service is possible worldwide. HYDAC's worldwide distributor network means that trained staff are close at hand to help our customers.

This ensures that HYDAC customers have the support of an experienced workforce both before and after sale.

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CONTENTS Page Catalogue section Page

1. HYDAC ACCUMULATOR TECHNOLOGY 2 E 3.000 2

2. QUALITY 2

3. SAFETY INFORMATION 4

4. REGULATIONS 5

5. PRODUCT OvERvIEw 6 8

5.1. BLADDER ACCUMULATORS

5.1.1 Standard E 3.201 19

5.1.2 Low pressure E 3.202 27

5.1.3 High pressure E 3.203 35

5.2. PISTON ACCUMULATORS

5.2.1 Standard E 3.301 39

5.2.2 Series SK280 E 3.303 51

5.3. DIAPHRAGM ACCUMULATORS E 3.100 55

5.4. METAL BELLOWS ACCUMULATORS E 3.304 61

5.5. HYDRAULIC DAMPERS E 3.701 67

5.6. SPECIAL ACCUMULATORS

5.7. ACCUMULATOR STATIONS E 3.653 85

5.8. ACCUMULATOR ACCESSORIES

5.8.1 Hydraulic accumulators with back-up nitrogen bottles E 3.553 91

5.8.2 Universal charging and testing unit E 3.501 97

5.8.3 Safety and shut-off block E 3.551 107

5.8.4 Safety equipment for hydraulic accumulators E 3.552 129

5.8.5 Supports for hydraulic accumulators E 3.502 135

5.8.6 ACCUSET SB E 3.503 143

6. INDUSTRIES AND APPLICATIONS 9 10

7. / 8. wEBSITE / SPECIFICATION FORMS 10 16

9. SIzING 17 18

10. NOTE 18

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3. SAFETY INFORMATIONHydraulic accumulators are pressure vessels as defined in the Pressure Equipment Directive 97/23/EC. They are closed vessels which are designed and built to store pressurized fluids. Hydraulic accumulators are charged with nitrogen which is separated from the fluid section by a piston, bladder or diaphragm. Hydraulic accumulators are specifically designed to store and then discharge pressurized fluids.The regulations for commissioning and operating hydraulic accumulators which are in force at the place of installation must be observed. The plant operator is exclusively responsible for ensuring compliance with these regulations.Relevant instructions are provided in the Operating Manuals for our products.As regards production and placing on the market, HYDAC has carried out a comprehensive risk assessment.

Similarly the manufacturer of products incorporating hydraulic accumulators must proceed accordingly (see Pressure Equipment Directive 97/23/EC) and the following principles must be adhered to and in this order of priority:

zRemoval or reduction of risks, insofar as this is reasonably possible, zApplication of appropriate protective measures against risks which cannot be eliminated, z If required, training of the users on the residual risks and instructions on appropriate special measures for reducing the risks during installation and/or operation.

For safe handling and operation, the operator must draw up a risk assessment for the installation site, particularly in combination with other components and risks.The resulting measures must be implemented accordingly.In the case of fundamental risks affecting hydraulic accumulators, e.g.

zExcessive pressure and z Increase in temperature (in the event of fire)

we already have the relevant products available.On no account must any welding, soldering or mechanical work be carried out on the accumulator shell. After the hydraulic line has been connected it must be completely vented. Work on systems with hydraulic accumulators (repairs, connecting pressure gauges etc) must only be carried out once the pressure and the fluid have been released.

3.1. RISK OF EXCESSIVE PRESSURE

Products:Safety and shut-off block for the fluid side in various sizes and versions. See catalogue section:

zSafety and shut-off block SAF/DSV No. 3.551

Gas safety valve and gas safety block for the gas sideBursting discs for gas and fluid sidesSee catalogue section:

zSafety equipment for hydraulic accumulators No. 3.552

3.2. RISK OF RISE IN TEMPERATURE

Products:Safety and Shut-off Block with solenoid-operated valve (open when de-energised) in conjunction with temperature monitoring.See catalogue section:

zSafety and shut-off block SAF/DSV No. 3.551 or on request

Temperature fusesSee catalogue section:

zSafety equipment for hydraulic accumulators No. 3.552

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4. PRESSURE EQUIPMENT DIRECTIvE REGULATIONS

On 29 November 1999 the Directive 97/23/EC (Pressure Equipment Directive) came into force and since 29 May 2002 has been exclusively binding in Europe. This directive applies to the design, manufacture, conformity assessment and placing on the market of pressure equipment and assemblies with a maximum permitted pressure of over 0.5 bar. It guarantees the free movement of goods within the European Community. EU member states must not prohibit, restrict or obstruct the placing on the market and the commissioning of pressure equipment on account of pressure-related hazards, if the equipment complies with the requirements of the pressure equipment directive and has the CE mark, and is subject to a conformity assessment.Hydraulic accumulators with a capacity of v 1 litre, a maximum permitted pressure PS 1000 bar and a pressure capacity PS v 50 bar l for gases of fluid group 2 (non-hazardous fluids) are subject to Article 3, Paragraph 3 of the European Pressure Equipment Directive and do not receive the CE mark.Inspection of the equipment and installation, operational safety and repeat testing are controlled as before by national laws. The equipment relating to safety is described in AD2000, ISO 4126 and EN 14359. The repeat testing intervals are stipulated in the new German health & safety regulations.

4.1. OVERSEASPressure accumulators which are installed overseas (outside the EU), are supplied with the relevant test certificates required in the country of installation.The country of installation must be stated at the time of ordering (see code in Model Code for the particular product: Certificate Code).

HYDAC pressure vessels can be supplied with virtually any test certificate. Please note that the permitted operating pressure can differ from the nominal pressure.Depending on the authority, the different material requirements must be observed.

4.2. CERTIFICATE CODE = S (U STAMP)

HYDAC Technology GmbH has had authorization since 1985 to use the Code Symbol "U STAMP" on pressure vessels which have been manufactured in conformity with the ASME specifications and to market these using the "NB" symbol, in the jurisdiction (area of application) of The National Board of Boiler and Pressure Vessel Inspectors.

4.3. CERTIFICATE CODE = P (KHK certificate)

For the Japanese market, HYDAC Technology GmbH has had approval as a "Self Inspecting Manufacturer" since the year 2000. Consequently, HYDAC is authorized to manufacture and test pressure vessels for the Japanese market and to import them into Japan.

4.4. CERTIFICATE CODE = A9 (MANUFACTURER LICENSING CHINA)

Since 1998 HYDAC Technology GmbH has had approval from the Chinese authority "SELO" as a manufacturer of pressure vessels and valves. HYDAC is therefore authorized to import welded bladder, piston and diaphragm accumulators, and safety valves, into the Chinese market.In conjunction with this approval, it is absolutely essential to provide the details of the end user/dealer when placing the order.

4.4. CERTIFICATE TABLEThe following table lists the codes used in the model code for different countries of installation.

Rest of the world Certificate code (AKz)

DZ Algeria U 3)AR Argentina U 3)AU Australia F 1)BS Bahamas E 3)BB Barbados U 3)BY Belarus A12BM Bermuda U 3)BO Bolivia U 3)BR Brazil U 3)CE Canada S1 2)CL Chile U 3)CN China A9CR Costa Rica E 3)EC Ecuador U 3)ET Egypt U 3)HK Hong Kong A9IS Iceland U 3)IN India U 3)ID Indonesia U 3)IL Israel U 3)JP Japan PJO Jordan U 3)KR Korea (Republic) U 3)KW Kuwait U 3)LB Lebanon U 3)LY Libya U 3)MY Malaysia U 3)MX Mexico U 3)NZ New Zealand TNG Nigeria U 3)NO Norway UPK Pakistan U 3)PE Peru U 3)PH Philippines U 3)PR Puerto Rico E 3)RU Russia A6SA Saudi Arabia U 3)SG Singapore U 3)ZA South Africa U 3)SD Sudan U 3)CH Switzerland USY Syria U 3)TW Taiwan U 3)TH Thailand U 3)TN Tunisia U 3)TR Turkey UUA Ukraine A10US USA S 3)YU Yugoslavia (former) U 3)

1) approval required in the individual territories2) approval required in the individual provinces3) alternative certificates possible

European member states Certificate code (AKz)

AT Austria

U

BE BelgiumBG BulgariaCY CyprusCZ Czech RepublicDK DenmarkEE EstoniaFI FinlandFR FranceDE GermanyGB Great BritainGR GreeceHU Hungary U 3)IE Ireland (Republic)

U

IT ItalyLV LatviaLT LithuaniaLU LuxembourgMT MaltaNL NetherlandsPL PolandPT PortugalRO RomaniaSK SlovakiaSI SloveniaES SpainSE Sweden

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5. PRODUCT OvERvIEw5.1. BLADDER

ACCUMULATORS5.1.1 StandardNominal volumes: 0.5 ... 200 lPermitted operating pressure: 330 ... 550 bar

Benefits of HYDAC bladder accumulators: zHigh discharge speeds, zNo pressure differential between fluid and gas sides, zCompact, maintenance-free, zHigh charging and discharge frequencies.

5.1.2 Low pressureNominal volumes: 2.5 ... 450 lPermitted operating pressure: up to 40 bar

5.1.3 High pressureNominal volumes: 1 ... 54 lPermitted operating pressure: 5 ... 1000 bar

5.2. PISTON ACCUMULATORS

5.2.1 StandardNominal volumes: up to 3300 lPermitted operating pressure: 210 ... 350 bar(higher pressures on request)

Benefits of HYDAC piston accumulators: zMinimal pressure differential between the fluid and gas sides, z Large usable volume, zVariable installation position, zMonitoring of the piston position possible using various systems, zParticularly suitable for back-up configurations, zHigh flow rates possible, zNo sudden discharge of gas when seals are worn.

5.2.2 Series SK280Nominal volumes: 0.16 ... 5 lPermitted operating pressure: 280 bar

5.3. DIAPHRAGM ACCUMULATORS

5.3.1 Diaphragm accumulatorsweld typeNominal volumes: 0.075 ... 4 lPermitted operating pressure: 50 ... 330 bar

Screw typeNominal volumes: 0.1 ... 4 lPermitted operating pressure: 210 ... 750 bar

Benefits of HYDAC diaphragm accumulators:

zDesign optimised for function and weight, zChoice of installation positions, zNo pressure differential between fluid side and gas side, z Low-maintenance and long service life.

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5.4. METAL BELLOWS ACCUMULATORS

5.4.1 Metal bellows accumulators for heavy diesel engines

Nominal volume: 3.8 lPermitted operating pressure: 50 bar

Series: SM50P-... other models on request

Benefits of the HYDAC metal bellows accumulator:

zGas-tight zMaintenance-free zMedia resistance over a wide range of temperatures

5.5. HYDRAULIC DAMPERS5.5.1 DampersNominal volumes: 0.075 ... 450 lPermitted operating pressure: 10 ... 1000 bar

Advantages of the HYDAC hydraulic damper:

zReduces pressure pulsations, z Improves the suction performance of displacement pumps, zPrevents pipe breaks and damage to valves, zProtects measuring equipment and its function in the system, zReduces noise level in hydraulic systems, zReduces maintenance and servicing costs and zExtends service life of the system.

5.5.2 SILENCERPermitted operating pressure: 330 bar

5.6. SPECIAL ACCUMULATORS

5.6.1 weight Reduced Hydraulic Accumulators

Over 80% reduction in weight compared to equivalent carbon steel accumulators.The choice ranges from weight-optimized accumulators, e.g. by using aluminium, through to light-weight and ultra light-weight accumulators.

5.6.2 Spring accumulatorsThese are fitted with a spring. The energy is produced from the spring force, instead of gas.Further information on request.

5.7. ACCUMULATOR STATIONS

HYDAC supplies fully assembled accumulator stations which are ready for operation, complete with all the necessary valve controls, fittings and safety equipment

z as an individual accumulator unit or z in a back-up version with nitrogen bottles to increase the effective volume.

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5.8. ACCUMULATOR ACCESSORIES

5.8.1 Hydraulic accumulators with back-up nitrogen bottles

HYDAC also offers nitrogen bottles which can be used to back up bladder and piston accumulators. Nitrogen bottles used as back-ups increase the gas volume in the accumulator.

Using HYDAC nitrogen bottles provides the following benefits:

zCost-effective expansion of the accumulator volume and as a result zSmaller accumulators for the same gas volume.

5.8.2 Universal charging and testing unit FPU-1

Charging hose, pressure gauge and pressure reducer for HYDAC and other makes of accumulator, up to 350 bar.Higher pressures on request

5.8.3 Safety and shut-off blockSAF/DSv

Nominal size: 10 ... 50Permitted operating pressure: 400 bar (DSV 350 bar)Pressure relief valve: Nominal width DN12

Benefits of the HYDAC Safety and Shut-off Block:

zMinimum of space and maintenance, zMinimum of installation required (1 SAF replaces as a rule up to 10 individual pipe connections), zConsiderable reduction in installation time, zCan be adapted to different types and also different makes of accumulator, and zAdditional valves (pilot-operated check valves, flow control valves, etc).

5.8.4 Safety equipment zGas safety valve GSV6 z Temperature fuse zBursting disc

zGas safety blockas safety equipment for HYDAC accumulator products.Approval according to Pressure Equipment Directive PED and CE mark.

Benefits of the HYDAC Gas safety block: zA gas safety block simplifies the operation of the hydraulic accumulator on the gas-side and also provides a means of attaching the above safety equipment using the various ports.

5.8.5 Supports for Hydraulic Accumulators

Accumulator sets, clamps and consoles for efficient mounting of hydraulic accumulators.

5.8.5 ACCUSET SBNominal volumes: 1 ... 50 lPermitted operating pressure: 330 bar

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HYDAC Technology GmbH is represented in almost all industries of the world which use hydraulic accumulators.The main sectors are industrial hydraulics, mobile technology and process technology.Further applications in oil & gas/offshore as well as more energy efficient systems utilizing accumulators are gaining in importance.Listed below is a selection of examples with accumulators/dampers which are typical for these industries:

6. INDUSTRIES AND APPLICATIONS

6.1. INDUSTRIAL HYDRAULICSAutomotive Industry

zGeneral industrial hydraulics, e.g. energy storage

Machine tools zSupport for the hydraulics for tool drive or tool change zEnergy storage in the compact hydraulics of machining centres

Plastics machinery zAccumulator stations for energy storage during the injection moulding process zPulsation damping on the hydraulic drive

Forming machines zAccumulators used to store energy to support the pump

Iron and steel industry zAccumulator to maintain the pressure in rolling mills zBlast furnace hydraulics

Thermal power plants zEmergency supply for turbine control system zPulsation damping on pumps z Lubrication, control and seal oil supply

wind turbines zAccumulators in the pitch control system zSupport of the pitch drive zAccumulators on braking units

Mining machinery zHydraulic accumulators, e.g. in suspended monorails zPulsation damping zComfort and safety for mobile working machines

Paper Industry zEnergy storage for emergency functions in friction bearing hydraulics zEnergy storage in high/low pressure power units

Test rigs and test systems zEnergy storage on crash test systems zPulsation damping on servohydraulic axes

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7. wEBSITEPlease visit us at the following address: www.hydac.com.

In addition to Industries, Service and Fluid Engineering, under Products Hydraulic Accumulators, you will find the standard product range and a comprehensive range of accessories from HYDAC TECHNOLOGY GmbH.

8. SPECIFICATION FORMSOur aim is to provide optimum customer service both before and after purchasing the accumulator.

The following specification forms are designed to help pre-select the required accumulator/damper or accessories.

You can also download these as a pdf document from the intranet and internet (www.hydac.com/Hydraulic accumulators) under the Downloads tab. You can then complete them at your convenience on your PC and also send them to your HYDAC contact, e.g. by E-Mail.

6.2. MOBILE TECHNOLOGYAutomotive technology

zAutomatic and manual transmission zAutomatic clutch systems zEngine management systems zPump noise damping zAccumulators for turbocharger emergency lubrication

Construction Machinery zAccumulators in braking systems zChassis damping zBucket damping zBoom damping on mobile cranes

Agricultural and forestry machines z Front loader damping zAccumulators in tractor suspension systems zStone strike protection for ploughs zBoom suspension on field sprayers

Municipal machines zEnergy storage zBoom damping zPulsation dampers zChassis damping

Lifting and material handling technology

zNoise-damping zEnergy recovery zBraking system

Shipping zWater treatment plants (pump support) zPulsation damping on diesel engines zHeave compensation (cranes) zEmergency function for lifeboats

6.3. PROCESS TECHNOLOGYChemical industry

zEnergy storage and pulsation damping on dosing pumps zSuction flow stabilisation on the suction side of pumps

Loading stations / Refineries zShock absorption for valve closing zPulsation damping on pipelines

Offshore / Oil & Gas zAccumulators to support valve closing systems zEnergy storage for deep sea rams zBlow Out Preventers (BOP) zEmergency function for safety systems zAccumulators on wellhead control systems

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HYDAC Technology GmbHIndustriegebiet

D-66280 Sulzbach/Saar Tel.: +49 (0) 68 97 / 509 - 01

Fax: +49 (0) 68 97 / 509 - 464 Internet: www.hydac.com

E-Mail: [email protected]

General ACCUMULATOR Specification Form (Page 1/2)(Subject to technical modifications)

Company: Location:

Project name: Originator:

E-Mail: Tel. no.:

Application: Requirement: pieces/year

Note:The appropriate accumulator can be calculated using the HYDAC Accumulator Simulation Program ASP. Download from www.hydac.com.

Comments:

Date: Name:

Type of accumulator Bladder accumulator Piston accumulator Diaphragm accumulator __________________

Fluids/medium

Fluid: Viscosity at 20 C: cSt

Density: kg/m Viscosity at operating temperature: cSt

Functioning of the pump Additional details on the accumulator

Continuous operation Intermittent operation Industry:Accumulator data Country of installation:

Max. operating pressure: bar Design/Certification:

Min. operating pressure: bar Specification:

Pre-charge pressure at 20 C (nitrogen): bar Materials*(See catalogue section: No. 3.000, Sizing) Accumulator shell:

Ambient temperature: C Fluid connection:

Operating temperature: C Elastomer:

Complete cycle time: s Additional information

Installation dimensions: mm

Fluid demand diagram for one pump and one consumer:

(height x ext.)

Fluid connection: Type:

Accumulator discharge rate: l/min For thread internalAccumulator discharge time: s externalFlow rate of the pump: l/min Standard:

Pump runs continuously: Gas connection:Pump starts after discharge: Colour/finish: internal

external

Alternatively: Fluid demand diagram for several pumpsand/or consumers (see Page 2)

Spare parts/ Accessories: see www.hydac.com

under Products/Accumulators

* dependent on operating temperature and/or fluid resistance

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General ACCUMULATOR Specification Form (Page 2/2)(Subject to technical modifications)

Fluid demand diagram for several pumps and/or consumers

Designation / ExampleQv = Consumer flow rate [l/s]EV = Switch-on time of consumer [s]AV = Switch-off time of consumer [s]EP = Switch-on time of pump [s]AP = Switch-off time of pump [s]

Please indicate cycle data below

Number of consumers: Number of pumps:

QV1= EV1= AV1= QP1= EP1= AP1=




Q[l/s]

EV4

QV4

EP2 AP2

QV1

QV2

QV3

EP1 AP1

EV1 AV1 AV2 AV3EV2 EV3 AV4

consumers

time [s]

pumps

time [s]

Q [l/s]

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SHOCK ABSORBER SPECIFICATION FORM (Page 1/2)(Subject to technical modifications)

Company: Location:


E-Mail: Tel. no.:


Note:The appropriate accumulator can be calculated using the HYDAC Accumulator Simulation Program ASP. Download from www.hydac.com.

Comments:

Date: Name:

Type of accumulator Bladder accumulator Piston accumulator Diaphragm accumulator

Cause of the pressure shock Accumulator data

When pump starts When pump switches off Max. operating pressure: bar

When check valve flap (valve) closes Min. operating pressure: barPre-charge pressure at 20 C (nitrogen): bar

Fluids/media

Fluid 1):

Density: kg/m

Pipeline data for a single pipe

Length: m

Diameter (internal): mm

Wall thickness: mm

Material of line:

Max. permitted pressure in the line: bar

Total closing time of the valve: s

Speed of sound in the system: m/s

* dependent on operating temperature and/or fluid resistance1) please send datasheet

Alternatively:Pipeline data for additional sections of pipe (see Page 2)

Pump data

Zero head: m

Pressure of the pump at the operating point: bar

Flow rate of the pump at the operating point: l/min

Materials*

Accumulator shell:

Fluid connection:

Elastomer:

Additional information on the accumulator/system

Available installation space: m

Industry:

Country of installation:

Design/Certification:

Specification:

Ambient temperature: C

Operating temperature: C


For thread internal

external

Standard:

Gas connection:Colour/finish: internal

externalSpare parts/Accessories: see www.hydac.com

under Products/Hyd. accumulators

(See catalogue section: No. 3.000, Sizing)

(L x W x H)

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L2 L3L1

Di1 Di2 Di3

H

Tank Tank

T

No. of different pipes: 3

L1 = 200 m Di1 = 100 mmL2 = 50 m Di2 = 200 mmL3 = 20 m Di3 = 500 mm

Typical values for speed of sound

Water = 1200 m/sFuel = 1100 m/s

Please complete below with the pipeline data

No. of different pipes:

L1 = m Di1 = mm L5 = m Di5 = mm

L2 = m Di2 = mm L6 = m Di6 = mm

L3 = m Di3 = mm L7 = m Di7 = mm

L4 = m Di4 = mm L8 = m Di8 = mm

SHOCK ABSORBER SPECIFICATION FORM (Page 2/2)(Subject to technical modifications)

Pipeline data for additional sections of pipe

Designation / ExampleH = Zero head of the pump [m] Di = Internal diameter of the pipe [mm]T = Closing time of the valve [s] (effectively approx. 30 % of the total closing time)L = Length of the pipeline [m]

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PULSATION DAMPER SPECIFICATION FORM(Subject to technical modifications)

Company: Location:


E-Mail: Tel. no.:


Note:The appropriate accumulator can be calculated using the HYDAC Accumulator Simulation Program ASP.Download from www.hydac.com.

Comments:

Date: Name:

Type of accumulator Bladder accumulator Piston accumulator Diaphragm accumulator

Fluids/medium

Fluid: Viscosity at 20 C: cSt

Density: kg/m Viscosity at operating temperature: cSt

Pump and system data

Oper. press./pump pressure: bar

Flow rate: l/min

Rpm: 1/min

No. of displacements:

single double acting

Pump factor: optional (if available)

Stroke volume: 1 dm

for piston pumps: VH = d2 x p

x H x 1064

d = piston: mm

H = stroke length: mm

for diaphragm pumps: see manufacturer's specifications

* dependent on operating temperature and/or fluid resistance1) see catalogue section: No. 3.000, Sizing 2) normally pre-charged with nitrogen (N2)

Accumulator data

Pre-charge pressure 1): bar

Operating temperature: C

Application: pressure side suction side

Required residual pulsation: %

Result: l gas volume 2)

Additional information

Installation dimensions: mm(Height x ext.)


For thread internal

external

Standard:

Gas connection:Colour/finish: internal

externalSpare parts/Accessories: see www.hydac.com

under Products/Hydraulic accumulators

Additional details on the accumulator

Industry:

Country of installation:

Design/Certification:

Specification:

Design pressure: bar

Design temperature: C

Materials*

Accumulator shell:

Fluid connection:

Elastomer:

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SILENCER SPECIFICATION FORM(Subject to technical modifications)

Company: Location:


E-Mail: Tel. no.:


0

E2 E1

E3

E4

E5 E6

E0 Silencer 1 2 3

6 5

4

Sizing example:

Pump: A10vSO71 Design pressure: 210 bar Silencer inlet: SAE 1 1/4 3000 PSIPump rpm: 1500 1/min No. of pump pistons: 9 Silencer outlet: SAE 1 1/4 3000 PSIFluid: Aral vitam GF Fluid density: 890 kg/m Design temperature: 50 C

Element no. Length [m] int. [m] ext. [m] Subsequent connection type Hose typeE1 0.5 0.020 0.030 Straight connection E2 0.4 0.200 Straight connection E3 1.5 0.025 0.040 T-junction 4SP (DIN EN 856)E4 0.6 0.015 0.025 Pressure relief valve E5 0.2 0.015 0.025 Right-angle E6 0.6 0.015 0.025 Shut-off valve

Design data:

Pump: Design pressure: bar Silencer inlet:Pump rpm: 1/min No. of pump pistons: Silencer outlet:Fluid: Fluid density: Design temperature: C

Element no. Length [m] int. [m] ext. [m] Subsequent connection type Hose type

E1

E2

E3

E4

E5

E6

E7

E8

E9

E10

E11

E12

Comments:

Date: Name:

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9. SIzING9.1. DEFINITION OF VARIABLES FOR SIZING A HYDRAULIC ACCUMULATORFunction principle Accumulator cycle Limits for the gas pre-charge pressureBladder accumulator

The accumulator is pre-charged with nitrogen. The separating element (piston, bladder, diaphragm) shuts off the fluid connection.

The minimum operating pressure should be higher than the gas pre-charge pressure. This should prevent the separating element from striking the fluid connection every time fluid is discharged.

Once the max. operating pressure is reached, the effective volume V is available in the accumulator:

p0 = Gas pre-charge pressurep1 = Minimum operating pressurep2 = Maximum operating pressureV0 = Effective gas volumeV1 = Gas volume at p1V2 = Gas volume at p2t0 = Gas pre-charge temperaturetmin = Min. operating temperaturetmax = Max. operating temperature

p0 0.9 p1with a permitted pressure ratio ofp2 : p0 4 : 1

For HYDAC low pressure accumulators, the following must also be taken into account:Type SB40: p0 max = 20 barType SB35H: p0 max = 10 bar

Piston accumulator

p0,tmin 2 bar (piston type 2)p0,tmin 10 bar (piston type 1)p0,tmin p1 - 5 bar

In extreme cases, during slow charging (isothermal) and rapid discharge (adiabatic) of the effective volume, and after accurate calculation, the gas pre-charge pressure p0 p1 can be selected.Accumulator supplied uncharged or with 2 bar storage pressure.

Diaphragm accumulator

a) Permitted pressure ratio: p2 : p0 Weld type: The pressure ratio of weld-type diaphragm accumulators is between 4 : 1 and 8 : 1, depending on the design, see catalogue section Diaphragm Accumulators, No. 3.100, Point 3.1. Screw type: All sizes: 10 : 1 Other pressure ratios on requestb) p0 0.9 p1

9.2. SELECTION OF GAS PRE-CHARGE PRESSURE

The selection of the gas pre-charge pressure defines the accumulator capacity. In order to obtain optimum utilization of the accumulator volume the following gas pre-charge pressures are recommended:

9.2.1 Recommended valuesfor energy storage:p0,t max = 0.9 p1

for shock absorption:p0,t max = 0.6 to 0.9 pm(pm = average operating pressure for free flow)

for pulsation damping:p0,t max = 0.6 pm(pm = average operating pressure)orp0,t max = 0.8 p1(for several operating pressures)

During operation the separating element (piston, bladder, diaphragm) must not touch the fluid-side connection.Since the volume of the gas increases as the temperature increases, the gas pre-charge pressure must be determined at the maximum operating temperature using the recommended values.

9.2.2 Limits for gas pre-charge pressure

(see right-hand column of table)

9.2.3 Temperature effectSo that the recommended gas pre-charge pressures can be maintained, even at relatively high operating temperatures, the p0 charge for charging and testing cold accumulators must be selected as follows:

p0, t charge = p0,t max tcharge + 273

tmax + 273

t0 = tcharge (gas charging temperature in C)To take the temperature effect into account when sizing accumulators, the pre-charge pressure p0 at min. temperature t0 must be selected as follows:

p0, t min = p0,t max tmin + 273

tmax + 273

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9.3. ACCUMULATOR SIZING ON YOUR PC

ASP - ACCUMULATOR SIMULATION PROGRAM

You want to size an accumulator for your hydraulic system and need to find out the required gas volume? How does the accumulator actually behave in the system?The formulae required for this are complicated and also have only limited relevance.

The solution: HYDAC ASP - Accumulator Simulation Program:

z Accumulator sizing on your PC with Windows interface for bladder, piston and diaphragm accumulators and systems using back-up nitrogen bottles, taking into account isentropic, isothermal and polytropic changes in condition. z Calculation of accumulator systems with the possibility of adding accumulators, consumers and pumps with their particular switch-on and switch-off times. z Simulation of pressure, temperature and volume over the given cycle time. Real gas equations are used for this and the accumulator type and its heat exchange behaviour is taken into account in the calculation. z Sizing of pulsation dampers. zCalculation of the gas volume and the residual pulsation of gas-filled pulsation dampers. z Sizing of shock absorbers, calculation of the required gas volume for "Joukowsky shock".

Complex pipe systems are possible on request. z Display of the gas compression and the degree of efficiency.

ExamplePetrol tanker filling station

When loading fuels into vehicles, ships or barrels, the flow is suddenly interrupted when the valve closes. This deceleration of mass results in a pressure shock which is also referred to as a Joukowsky pressure shock. By using a hydraulic accumulator, the pressure shock can be reduced to a tolerable level.

Given parameters: z Temperature: 20 C Fluid: PETROL (Premium leaded) (Density: 0.760 kg/dm3) z Pipe length from pump to valve: 900 m z Pipe internal: Internal diameter = 107.1 mm (DN100 = 114.3 external, wall thickness = 3.6 mm) z Zero head of the pump: 147.5 m, equivalent to 11 bar z Pump pressure at operating point: 10 bar (pre-charge pressure p0 = 9 bar) z Max. permitted pressure of the pipe: 12 bar z Flow rate: 500 l/min z Closing time of the shut-off valve: 1s (0.33 s effectively) z Pipe material: Steel E = 2.1 x 105 N/mm

Required:a. Maximum Joukowsky pressure shock in barb. Maximum flow velocity in the pipe in m/sc. Required accumulator gas volume in litre

Solution:a. Maximum Joukowsky pressure shock: 18.867 barb. Maximum flow velocity: 0.925 m/sc. Required accumulator gas volume: 41.795 l

10. NOTEThe information in this brochure relates to the operating conditions and applications described.For applications and operating conditions not described here, please contact the relevant technical department.Subject to technical modifications.

HYDAC Technology GmbH Industriegebiet 66280 Sulzbach/Saar, Germany Tel.: +49 (0) 68 97 / 509 - 01 Fax: +49 (0) 68 97 / 509 - 464 Internet: www.hydac.com E-Mail: [email protected]

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Bladder AccumulatorsStandard

1. DESCRIPTION1.1. FUNCTIONFluids are practically incompressible and cannot therefore store pressure energy.The compressibility of a gas is utilised in hydraulic accumulators for storing fluids. HYDAC bladder accumulators are based on this principle, using nitrogen as the compressible medium.A bladder accumulator consists of a fluid section and a gas section with the bladder acting as the gas-proof screen. The fluid around the bladder is connected to the hydraulic circuit so that the bladder accumulator draws in fluid when the pressure increases and the gas is compressed. When the pressure drops, the compressed gas expands and forces the stored fluid into the circuit. HYDAC bladder accumulators can be used in a wide variety of applications, some of which are listed below:

z energy storage z emergency operation z force equilibrium z leakage compensation z volume compensation z shock absorption z vehicle suspension z pulsation damping

See catalogue section: z Hydraulic Dampers No. 3.701

1.2. DESIGN

seal cap

lock nut

shell

gas valve

valve protection cap

bladder

spaceranti-extrusion ring

seal ringlock nut

oil valvevent screw

Design zStandard Bladder Accumulator SB330/400/500/550 HYDAC standard bladder accumulators consist of the pressure vessel, the flexible bladder with gas valve and the hydraulic connection with check valve. The pressure vessel is seamless and manufactured from high tensile steel. zBladder accumulator SB 330NThe flow optimised design of the standard oil valve enables the maximum possible operating fluid flow rate to increase to 25 l/s on this accumulator type. zHigh Flow bladder accumulator SB330HHYDAC high flow bladder accumulators, type SB330H, are high performance accumulators with a flow rate of up to 30 l/s. The fluid connection is enlarged to allow higher flow rates.

1.3. BLADDER MATERIALThe following elastomers are available as standard:

zNBR (acrylonitrile butadiene rubber, perbunan), z IIR (butyl rubber), z FKM (fluoro rubber, Viton), zECO (ethylene oxide epichlorohydrin rubber).

The material must be selected according to the particular operating fluid and temperature.When choosing the elastomer, allowances must be made for the fact that the gas can cool down to below the permitted elastomer temperature if there are adverse discharge conditions (high pressure ratio p2/p0, high discharging velocity). This can cause cold cracking in the elastomer. The gas temperature can be calculated using the HYDAC Accumulator Simulation Program ASP.

1.4. CORROSION PROTECTION

For operation with chemically aggressive media, the accumulator shell can be supplied with corrosion protection, such as plastic coating on the inside or chemical nickel-plating. If this is insufficient, then stainless steel accumulators must be used.

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1.5. MOUNTING POSITIONHYDAC bladder accumulators can be installed vertically, horizontally and at a slant. When installing vertically or at a slant, the oil valve must be at the bottom. On certain applications listed below, particular positions are preferable:

zEnergy storage: vertical, zPulsation damping: any position from horizontal to vertical, zMaintaining constant pressure: any position from horizontal to vertical, zVolume compensation: vertical.

If the mounting position is horizontal or at a slant, the effective volume and the maximum permitted flow rate of the operating fluid are reduced.

1.6. TYPE OF MOUNTING By using an appropriate adapter, HYDAC accumulators, up to size 1 l, can be mounted directly inline.For strong vibrations and volumes above 1 litre, we recommend the use of HYDAC accumulator supports or the HYDAC accumulator mounting set.See catalogue sections:

zSupports for Hydraulic Accumulators No. 3.502 zACCUSET SB No. 3.503

2. TECHNICAL SPECIFICATIONS

2.1. EXPLANATORY NOTES2.1.1 Operating pressureSee tables (may differ from nominal pressure for foreign test certificates).

2.1.2 Nominal volumeSee tables

2.1.3 Effective gas volumeSee tables Based on nominal dimensions, this differs slightly from the nominal volume and must be used when calculating the effective volume.

2.1.4 Effective volumeVolume of fluid which is available between the operating pressures p2 and p1.

2.1.5 Max. flow rate of operating fluid In order to achieve the max. flow rate given in the tables, the accumulator must be mounted vertically. It must be noted that a residual fluid volume of approx. 10 % of the effective gas volume remains in the accumulator.

2.1.6 FluidsThe following sealing and bladder materials are suitable for the fluids listed below.Material FluidsNBR20 Mineral oils (HL, HLP,

HFA, HFB, HFC), waterECO Mineral oilIIR Phosphate esterFKM Chlorinated hydro-

carbons, petrol

2.1.7 Permitted operating temperatureThe permitted operating temperatures are dependent on the application limits of the metal materials and the bladder.The standard valve bodies, gas valves and accumulator shells are suitable for temperatures from -10 C ... +80 C.Outside these temperatures, special material combinations must be used. The following table shows the correlation between bladder material and application temperature.Material Temperature rangesNBR20 -15 C ... + 80 CNBR21 -50 C ... + 80 CNBR22 -30 C ... + 80 CECO -30 C ... +120 CIIR -40 C ... +100 CFKM -10 C ... +150 C

2.1.8 Gas chargingHydraulic accumulators must only be charged with nitrogen. Never use other gases. RISK OF EXPLOSION! In principle, the accumulator may only be charged with nitrogen class 4.5, filtered to < 3 m. If other gases are to be used, please contact HYDAC for advice.


p0 0.9 p1with a permitted pressure ratio of: p2 : p0 4 : 1p2 = max. operating pressurep0 = gas pre-charge pressure

2.1.10 Certificate codes

Australia F1 1)

Brazil U3 3)

Canada S1 2)

China A9CIS A6EU member states UIndia U3 3)

Japan PNew Zealand TSwitzerland UUkraine A10USA S

1) Approval required in the individual territories2) Approval required in the individual provinces3) Alternative certificates possible

On no account must any welding, soldering or mechanical work be carried out on the accumulator shell. After the hydraulic line has been connected it must be completely vented.Work on systems with hydraulic accumulators (repairs, connecting pressure gauges etc) must only be carried out once the pressure and the fluid have been released. Please read the Operating Manual! No. 3.201.CENote:Application examples, accumulator sizing and extracts from approvals regulations on hydraulic accumulators can be found in the following catalogue section:

zAccumulators No. 3.000

2.1.11 Gas side connectionStandard

Series Volume [l]

Gas valve type

SB330 / SB400

< 1 5/8-18UNF< 50 7/8-14UNF 50 M50x1.5 / 7/8-14UNF

other pressure ranges on request.

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2.2. MODEL CODE (also order example)

SB330 H 32 A 1 / 112 U 330 A 050 SeriesType code H = high flow N = increased flow, standard oil valve dimensionsA = shock absorberP = pulsation damper S = suction flow stabiliserB = bladder top-repairable Combinations possible, e.g. HB - High flow with top-repairable bladder orPH - pulsation damper with high flow rate. no details = standardNominal volume [l]Fluid connection A = standard connection, thread with internal seal face F = flange connection C = valve mounting with screws on underside E = sealing surfaces on front interface (e.g. on thread M50x1.5 - valve) G = male thread S = special connection, to customer specificationGas side 1 = standard model (see point 2.1.11) 2 = back-up model 3 = gas valve 7/8-14UNF with M8 female thread 4 = gas valve 7/8-14UNF with gas valve connection 5/8-18UNF 5 = gas valve M50x1.5 in accumulators smaller than 50 l 6 = 7/8-14UNF gas valve 7 = M28x1.5 gas valve 8 = M16x1.5 gas valve 9 = special gas valve, to customer specificationMaterial code 1)Standard model = 112 for mineral oils depending on operating medium others on requestFluid connection 1 = carbon steel 2 = high tensile steel 3 = stainless steel 3)6 = low temperature steelAccumulator shell 0 = plastic coated (internally) 1 = carbon steel 2 = chemically nickel-plated (internal coating) 4 = stainless steel 3)6 = low temperature steelAccumulator bladder 2)2 = NBR20 3 = ECO 4 = IIR (butyl) 5 = NBR21 (low temperature) 6 = FKM 7 = Others 9 = NBR22Certificate code U = PED 97/23/ECPermitted operating pressure [bar]Connection Thread, codes for fluid connections: A, C, E, G A = thread to ISO 228 (BSP) B = thread to DIN 13 or ISO 965/1 (metric) C = thread to ANSI B1.1 (UN..-2B seal SAE J 514)D = thread to ANSI B1.20.1 (NPT) S = special thread, to customer specificationFlange, codes for fluid connection: F A = DIN flange B = flange ANSI B16.5 C = SAE flange 3000 psi D = SAE flange 6000 psi S = special flange, to customer specificationPre-charge pressure p0 [bar] at 20 C, must be stated clearly, if required!

1) Not all combinations are possible2) When ordering spare bladder, please state diameter of the smaller shell port3) Depending on type and pressure rating

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3. DIMENSIONS AND SPARE PARTS3.1. DIMENSIONS

Dimensions

Adaptor for special thread

Nom

inal

vol

ume

Valv

e

Max

. ope

ratin

g pr

essu

re

(PE

D 9

7/23

/EC

)

Effe

ctiv

e ga

s vo

lum

e

Wei

ght

A max.

B C D max.

J thread

E SW Q 1)

[l] [bar] [l] [kg] [mm] [mm] [mm] [mm]ISO 228 [mm] [mm] [l/s]

0.5

Standard

400 0.5 2.8 27057

33.5 95.5G 3/4 50 32 4

1330

14.5 302

58

118550 8.5 334 68 121 G 1

67

45 6

2.5330 2.4 10 531 63 118 G 1 1/4 50 10550 2.5

13.5539 68 121 G 1 45 6

4330

3.7 419 63 173 G 1 1/4 50 10400

5 550 4.9 23 867 68 121 G 1 45 66 330 5.7 15 531

63 173G 1 1/4

50 10 10,2) 330 9.3 25 728 G 1 1/4

10

Standard330

9.3 31.5 568 10358

229G 2 100 70

15N 25H 9 34.5 603 138 G 2 1/2 125 90 30

Standard400 9.3 37.5 572 103 233

G 2 100 70 15500 8.8 45 585 77 68 241

13

Standard330

1243 686 103

58229

G 2 100 7015

N 25H 46 695 138 G 2 1/2 125 90 30Standard 400 49 666 103 233 G 2 100 70 15

20

Standard330

18.4 50.5 896 10358

229G 2 100 70

15N 25H 17.5 53.5 931 138 G 2 1/2 125 90 30

Standard400 18.4 63.5 896 103 233

G 2100 70

15500 17 75.5 901 77 68 241 110 75

24Standard

33023.6 69 1062 103

58 229G 2 100 70

15N 25H 24 72 1097 138 G 2 1/2 125 90 30

32

Standard330

33.9 87 1411 10358

229G 2 100 70

15N 25H 32.5 90 1446 138 G 2 1/2 125 90 30

Standard400 33.9 104.5 1411 103 233

G 2100 70

15500 33.5 127 1446 77 68 241 110 75

50330

47.5117.5 1931 103

68229

G 2 100 7015

N 25H 120.5 1966 138 G 2 1/2 125 90 30

Standard400 142 1931 103 233

G 2 10070

15500 48.3 169 1951 77 241 75

60

Standard 330

60 182 1156

138 68356

G 2 1/2 125 90 30

80 85 221 1406100 105 255 1656130 133 305 1976160 170 396 2006

406200 201 485 2306

1) Q = max. flow rate of operating fluid2) slimline version, for confined spaces

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3.2. SPARE PARTS SB330/400/440/500/550

SB330H / SB330N

Detail "X" SB330/400 0.5 ... 6 l

SB330/400/500 10 ... 200 l and SB330H 10 ... 200 l SB550 1 ... 5 l

3.3. REPAIR KITSNBR, carbon steel Nominal volume: 0.5 ... 200 litres Standard gas valveNom. volume [l] Part no. 0.5 02128169 1 02106261 2.5 02106200 4 02106204 5 02106208 6 02112100 10* 03117512 10 02106212 13 02106216 20 02106220 24 02106224 32 02106228 50 02106252 60 03117513 80 03117514 100 03117515 130 03117516 160 03117517 200 03117558* slimline version for confined spaces others on request

Designation ItemBladder assemblyconsisting of:

Bladder 2Gas valve insert* 3Lock nut 4Seal cap 5Valve protection cap 6O-ring 7

Seal kit consisting of:

O-ring 7Washer 15O-ring 16Vent screw 19Support ring 23O-ring 27

Repair kit 1)consisting of:

Bladder assembly (see above)Seal kit (see above)

Anti-extrusion ring 14Oil valve assembly consisting of:

Valve assembly (items 9-13) 9Anti-extrusion ring 14Washer 15O-ring 16Spacer 17Lock nut 18Vent screw 19Support ring 23

* available separately1) When ordering, please state diameter of the smaller

shell port.Item 1 not available as a spare part.Item 19 for NBR/Carbon steel: seal ring (item 20)

is includedItem 25 must be ordered as an accessory (see Point 4).

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4. ACCESSORIES FOR BLADDER ACCUMULATORS

4.1. ADAPTERS (GAS SIDE)To monitor the accumulator pre-charge pressure, HYDAC offers a selection of gas side adapters.For standard connection sizes (7/8-14UNF) the adapters shown below are available and must be stated separately at time of ordering.For other gas-side accumulator connections (e.g. 5/8-18UNF) please contact your HYDAC agent.

4.1.1 Pressure gauge model:Gas side connection on the bladder accumulator for permanent monitoring of the pre-charge pressure

Pressure gauge 63

Gauge indication range

Pressure gaugePart no.

Adapter body* Part no.

Adapter assemblyPart no.

00239275

003666210 - 10 bar 00614420 021084160 - 60 bar 00606886 030933860 - 100 bar 00606887 021047780 - 160 bar 00606888 030323480 - 250 bar 00606889 021002170 - 400 bar 00606890 02102117

* pmax= 400 bar





00363713


* pmax= 400 bar

4.1.2 Pressure gauge model with shut-off valveGas side connection on the bladder accumulator for permanent monitoring of the pre-charge pressure with shut-off option.

gauge 100

gauge shut-off valve

appr

ox.

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4.1.3 Remote monitoring of the pre-charge pressureTo monitor the pre-charge pressure in hydraulic accumulators remotely, gas side adapters with pressure gauge and mounting holes are available.In order to connect these adapters directly with the hydraulic accumulator using appropriate lines, accumulator adapters are also available for connection at the top (see diagram 1) or for side-connection (see diagram 2).





02116746


* pmax= 400 bar

D1 Threaded connection

D2 [mm]

T Adapter body* Part no.

Adapter assembly Part no.

Diag.

ISO228- G 1/4 2514

00238709 02109481 100241740 02102042 2

ISO228- G 3/8 2800355021 02109483 103280414 00366607 2

ISO228- G 1/2 34 1602110594 02110636 100237884 00366608 2

* pmax= 400 bar

D1 Accum. conn.*

D2

D3

L1

L2

L3

SW

O-ring

Part no.

(ISO228-BSP) [mm] [mm] [mm] [mm] [mm] [mm] [mm]

NBR/Carbon steel

G 3/4G 3/8

2855

2812 32

17x302104346

G 1/2 60 14 36 02104348

G 1 1/4

G 3/8 2850

37

1246

30x3

02116345G 1/2 34 14 02105232G 3/4 44 16 02104384G 1 50 67 18 65 02110124

G 2

G 1/2 3460

44

1465

48x3

02104853G 3/4 44 16 02104849G 1 1/4 60 20 02107113G 1 1/2 68 80 22 70 02105905

* others on request

gauge 63

O-ring

2 holes

approx.

Diagram 1 Diagram 2

4.2. ADAPTERS FOR STANDARD BLADDER ACCUMULATORS (FLUID SIDE)

To connect the bladder accumulator to pipe fittings. These are available separately.

5. NOTEThe information in this brochure relates to the operating conditions and applications described. For applications and operating conditions not described, please contact the relevant technical department. Subject to technical modifications.

HYDAC Technology GmbH Industriegebiet 66280 Sulzbach/Saar, Germany Tel.: +49 (0) 68 97 / 509 - 01 Fax: +49 (0) 68 97 / 509 - 464 Internet: www.hydac.com E-Mail: [email protected]

O-ring 11x2

hex.32

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Bladder AccumulatorsLow Pressure

1. DESCRIPTION1.1. FUNCTIONFluids are practically incompressible and cannot therefore store pressure energy.The compressibility of a gas is utilised in hydraulic accumulators for storing fluids. HYDAC bladder accumulators are based on this principle, using nitrogen as the compressible medium.A bladder accumulator consists of a fluid section and a gas section with the bladder acting as the gas-proof screen. The fluid around the bladder is connected to the hydraulic circuit so that the bladder accumulator draws in fluid when the pressure increases and the gas is compressed. When the pressure drops, the compressed gas expands and forces the stored fluid into the circuit.HYDAC bladder accumulators can be used in a wide variety of applications, some of which are listed below:

z energy storage z emergency operation z force equilibrium z leakage compensation z volume compensation z shock absorption z vehicle suspension z pulsation damping

See catalogue section: zHydraulic Dampers No. 3.701

1.2. DESIGNHYDAC low pressure bladder accumulators consist of a welded pressure vessel, a flexible bladder with gas valve and a hydraulic connection with check valve or a perforated disc. The table shows the different models which are described in greater detail in the pages that follow:Designation Perm.

pressure [bar] 2)

Volume [l]

Q 1)

[l/s]SB40- 2.5 ... 50

402.5 - 50 7

SB40- 70 ... 220 70 - 220 30SB35HB- 20 ... 50 35 20 - 50 20SB16A- 100 ... 450 16

100 - 45015

SB35A- 100 ... 450 35SB16AH- 100 ... 450 16

20SB35AH- 100 ... 450 35

1) Q = max. flow rate of pressure fluid2) Higher pressures on request

1.3. BLADDER MATERIALThe following elastomers are available as standard:


The material must be selected according to the particular operating fluid and temperature. When choosing the elastomer, allowances must be made for the fact that the gas can cool down to below the permitted elastomer temperature if there are adverse discharge conditions (high pressure ratio p2/p0, high discharging velocity). This can cause cold cracking in the elastomer. The gas temperature can be calculated using the HYDAC Accumulator Simulation Program ASP.

1.4. CORROSION PROTECTION

For operation with chemically aggressive media, the accumulator shell can be supplied with corrosion protection, such as plastic coating on the inside or chemical nickel-plating. If this is insufficient, then stainless steel accumulators must be used.

1.5. MOUNTING POSITIONHYDAC bladder accumulators can be installed vertically, horizontally and at a slant. When installing vertically or at a slant, the oil valve must be at the bottom. On certain applications listed below, particular positions are preferable:

zEnergy storage: vertical, zPulsation damping: any position from horizontal to vertical, zMaintaining constant pressure: any position from horizontal to vertical, zPressure surge damping: vertical, zVolume compensation: vertical.

If the mounting position is horizontal or at a slant, the effective volume and the maximum permitted flow rate of the operating fluid are reduced.Bladder accumulators SB16A / SB35A and SB16AH / SB35AH must only be installed vertically with the gas side at the top.

1.6. TYPE OF MOUNTING For strong vibrations and volumes above 1 litre, we recommend the use of HYDAC accumulator supports or the HYDAC accumulator mounting set.See catalogue sections:

zSupports for Hydraulic Accumulators No. 3.502 zACCUSET SB No. 3.503

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2. TECHNICAL SPECIFICATIONS

2.1. EXPLANATORY NOTES2.1.1 Operating pressureSee tables (may differ from nominal pressure for foreign test certificates).

2.1.2 Nominal volumeSee tables

2.1.3 Effective gas volumeSee tables Based on nominal dimensions, this differs slightly from the nominal volume and must be used when calculating the effective volume.

2.1.4 Effective volumeVolume of fluid which is available between the operating pressures p2 and p1.

2.1.5 Max. flow rate of the operating fluid

In order to achieve the max. flow rate given in the tables, the accumulator must be mounted vertically. It must be noted that a residual fluid volume of approx. 10 % of the effective gas volume remains in the accumulator.

2.1.6 FluidsThe following sealing and bladder materials are suitable for the fluids listed below.

Material FluidsNBR Mineral oils (HL, HLP, HFA,

HFB, HFC), waterECO Mineral oilIIR Phosphate ester, waterFKM Chlorinated hydrocarbons,

petrol

2.1.7 Permitted operating temperatureThe permitted operating temperatures are dependent on the application limits of the metal materials and the bladders.The standard valve bodies, gas valves and accumulator shells are suitable for temperatures from -10 C ... +80 C.Outside these temperatures, special material combinations must be used. The following table shows the correlation between bladder material and application temperature.

Material Temperature rangesNBR20 -15 C ... +80 CNBR21 -50 C ... +80 C

NBR22 -30 C ... +80 C

ECO -30 C ... +120 C

IIR -40 C ... +100 CFKM -10 C ... +150 C

2.1.8 Gas chargingHydraulic accumulators must only be charged with nitrogen. Never use other gases. RISK OF EXPLOSION!In principle, the accumulator may only be charged with nitrogen class 4.5, filtered to < 3 m. If other gases are to be used, please contact HYDAC for advice.


p0 0.9 p1with a permitted pressure ratio of: p2 : p0 4 : 1p2 = max. operating pressurep0 = gas pre-charge pressureFor HYDAC low pressure accumulators, the following must also be taken into account:Type SB40: p0 max = 20 barType SB35HB: p0 max = 10 bar

2.1.10 Certificate codes

Australia F1 1)

Brazil U3 3)

Canada S1 2)

China A9CIS A6EU member states UIndia U3 3)

Japan PNew Zealand TSwitzerland UUkraine A10USA Sothers on request

1) Approval required in the individual territories 2) Approval required in the individual provinces 3) Alternative certificates possible

On no account must any welding, soldering or mechanical work be carried out on the accumulator shell. After the hydraulic line has been connected it must be completely vented.Work on systems incorporating hydraulic accumulators (repairs, connecting pressure gauges etc) must only be carried out once the pressure and the fluid have been released. Please read the Operating Manual! No. 3.201.CENote:Application examples, accumulator sizing and extracts from approvals regulations on hydraulic accumulators can be found in the following catalogue section:

zAccumulators No. 3.000

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2.2. MODEL CODE (also order example)

SB40 A 100 F 7 / 112 U 40 A SeriesType code H = high flow N = increased flow, standard oil valve dimensions A = shock absorber B = bladder top-repairable Combinations possible, e.g. HB - High flow with top-repairable bladder no details = standardNominal volume [l]Fluid connection A = standard connection, thread with internal seal face F = flange connection C = valve mounting with screws on underside E = sealing surfaces on front interface (e.g. on thread M50x1.5 - valve) G = male thread S = special connection, to customer specificationGas side 1 = standard model 2 = back-up model 3 = gas valve 7/8-14UNF with M8 female thread 4 = gas valve 7/8-14UNF with gas valve connection 5/8-18UNF 5 = gas valve M50x1.5 in accumulators smaller than 50 l 6 = 7/8-14UNF gas valve 7 = M28x1.5 gas valve 8 = M16x1.5 gas valve 9 = special gas valve, to customer specificationMaterial code 1)Standard model = 112 for mineral oils depending on operating medium Others on requestFluid connection 1 = carbon steel 2 = high tensile steel 3 = stainless steel 3)6 = low temperature steelAccumulator shell 0 = plastic coated (internally) 1 = carbon steel 2 = chemically nickel-plated (internal coating) 4 = stainless steel 3)6 = low temperature steelAccumulator bladder 2) 4)2 = NBR20 3 = ECO 4 = IIR (butyl) 5 = NBR21 (low temperature) 6 = FKM 7 = Others 9 = NBR22Certificate code U = PED 97/23/ECPermitted operating pressure [bar]Connection Thread, codes for fluid connections: A, C, E, G A = thread to ISO 228 (BSP) B = thread to DIN 13 or ISO 965/1 (metric) C = thread to ANSI B1.1 (UN..-2B seal SAE J 514)D = thread to ANSI B1.20.1 (NPT) S = special thread, to customer specificationFlange, codes for fluid connection: F A = EN 1092-1 welding neck flange B = flange ASME B16.5 C = SAE flange 3000 psi D = SAE flange 6000 psi S = special flange, to customer specificationRequired gas pre-charge pressure must be stated separately!

1) Not all combinations are possible2) When ordering spare bladder, please state diameter of the smaller shell port3) Depending on type and pressure rating4) Standard materials, all other materials on request

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3. LOw PRESSURE ACCUMULATORS3.1. STANDARD BLADDER ACCUMULATORS

SB40-2.5 ... 503.1.1 DesignHYDAC standard low pressure accumulators consist of:

zA welded pressure vessel which can be treated with various types of corrosion protection for chemically aggressive fluids, or can be supplied in stainless steel. zA bladder with gas valve. The bladders are available in the elastomers listed under point 2.1. zA hydraulic connector with a perforated disc which is held in place with retaining ring.

3.1.2 DimensionsSB40-2.5 ... 50

3.1.3 Spare partsSB40-2.5 ... 50

Description ItemBladder assembly 1)consisting of: Bladder 2 Gas valve insert* 3 Lock nut 4 Seal cap 5 Valve protection cap 6 O-ring 7Seal kit consisting of: O-ring 7 Vent screw 13 Seal ring 14 O-ring 15Repair kit 1)consisting of: Bladder assembly (see above) Seal kit (see above)Hydraulic connector assembly consisting of: Perforated disc 10 Anti-extrusion ring 11 Retaining ring 12 Vent screw 13 Seal ring 14 O-ring 15* available separately 1) When ordering, please state diameter of the smaller shell port.Item 1 not available as a spare part.

SB40-2.5 ... 50Permitted operating pressure 40 bar (PED 97/23/EC)Nominal volume [l]

Eff. gas volume [l]

Weight [kg]

A [mm]

B [mm]

C [mm]

D [mm]

J thread ISO DIN 13

K* thread ISO 228

SW [mm]

Q 1) [l/s]

2.5 2.5 9 541122

68

108

M100x2 G 236

7

5 5.0 13 89110 8.7 14 533

106 21920 18.0 23 84332 33.5 38 136350 48.6 52 1875 68 2)* Item 16 must be ordered separately1) Q = max. flow rate of operating fluid (at approx. 0.5 bar pressure drop via adapter)2) Lock nut

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3.2. BLADDER ACCUMULATORS SB40-70 ... 220

3.2.1 DesignHYDAC low pressure accumulators, type SB40-70 ... 220 consist of:

zA welded pressure vessel which is compact and yet suitable for high flow rates and large volumes. The pressure vessel is manufactured in carbon steel or in stainless steel. zA bladder with gas valve. zA hydraulic connector with check valve.

3.2.2 DimensionsSB40-70 ... 220

3.2.3 Spare partsSB40-70 ... 220

Description ItemBladder assembly 1)consisting of: Bladder 2 Gas valve insert* 3 Lock nut 4 Seal cap 5 Valve protection cap 6 O-ring 7Seal kit consisting of: O-ring 7 Washer 15 O-ring 16 Vent screw 19 Support ring 23 O-ring 27Repair kit 1)consisting of: Seal kit (see above) Bladder assembly (see above)Anti-extrusion ring 14Oil valve assembly consisting of: Valve assembly (items 9-13) 9 Anti-extrusion ring 14 Washer 15 O-ring 16 Spacer 17 Lock nut 18 Vent screw 19 Support ring 23* available separately1) When ordering, please state diameter of the smaller

shell port.Item 1 not available as a spare part.Item 19 for NBR/Carbon steel: seal ring (item 20) included

SB40-70 ... 220Permitted operating pressure 40 bar (PED 97/23/EC)Nominal volume [l]

Eff. gas volume [l]

Weight [kg]

A max. [mm]

B [mm]

C [mm]

D [mm]

J thread ISO 228

Q 1) [l/s]

70 64 94 1199

137 78356

G 2 1/2 30100 111 113 1629130 133 133 1879190 192 169 2086

407220 220 193 2330

1) Q = max. flow rate of operating fluid

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3.3. LOW PRESSURE ACCUMULATORS SB16/35A AND SB16/35AH

3.3.1 DesignHYDAC low pressure bladder accumulators for large volumes, type SB35A and SB16A are in a weld construction in carbon steel or stainless steel.The hydraulic outlet is covered by a perforated disc which prevents the flexible bladder extruding from the shell. The bladder is top-repairable.

3.3.3 Spare parts SB16/35A, SB16/35AH

Description ItemBladder 2Lock nut 3O-ring 11Seal ring 13Vent screw 18O-ring 19Retaining ring 21O-ring 25

3.3.2 Dimensions SB16/35A, SB16/35AH

welding neck flangeDN100 PN16/PN40 EN1092-1/11 (others on request)

welding neck flange DN80 PN16/PN40 EN1092-1/11 (others on request)

SB16/35APermitted operating pressure 16/35 bar (PED 97/23/EC)

Nominal volume [l]

Eff. gas volume [l]

Weight [kg]

A (approx.) [mm]

B (approx.) [mm]

C (approx.) [mm]

DN*

SB16A SB35A SB16A SB35A SB16A SB35A SB16A SB35A

100 99 84 144 880 880 390 403

185 198 100

150 143 101 161 1070 1080 490 503200 187 122 223 1310 1320 685 698300 278 155 288 1710 1720 975 988375 392 191 326 2230 2240 1250 1263450 480 237 386 2325 2635 1465 1478

SB16/35AHPermitted operating pressure 16/35 bar (PED 97/23/EC)

Nominal volume [l]

Eff. gas volume [l]

Weight [kg]

A (approx.) [mm]

B (approx.) [mm]

C (approx.) [mm]

DN*

SB16AH SB35AH SB16AH SB35AH SB16AH SB35AH SB16AH SB35AH

100 99 93 153 957 965 457 465

245 254 80

150 143 110 170 1157 1165 557 565200 187 131 230 1417 1425 842 850300 278 164 297 1865 1873 1092 1100375 392 200 335 2307 2315 1342 1350450 480 246 395 2702 2710 1542 1550

* to EN1092-1/11 / PN16 or PN40 others on request

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3.4. HIGH FLOW BLADDER ACCUMULATOR SB35HB

3.4.1 DesignHYDAC high flow bladder accumulators type SB35HB are high performance accumulators for flow rates of up to 20 l/s at 2 bar Dp.They consist of a pressure vessel in a weld construction and a flexible bladder with gas valve. The pressure vessel contains a fixed perforated disc, permitting a high flow rate through its large free cross-section. For use with chemically aggressive fluids, the shell can be manufactured in stainless steel. See point 2.1. for bladder materials.

3.4.2 DimensionsSB35HB

3.4.3 Spare partsSB35HB

the bladder is top- repair- able.

welding neck flange DN50 / PN40 EN1092-1/11 (others on request)

4. NOTEThe information in this brochure relates to the operating conditions and applications described.For applications and operating conditions not described, please contact the relevant technical department.Subject to technical modifications.

HYDAC Technology GmbHIndustriegebiet66280 Sulzbach/Saar, GermanyTel.: +49 (0) 68 97 / 509 - 01 Fax: +49 (0) 68 97 / 509 - 464 Internet: www.hydac.com E-Mail: [email protected]

SB35HBPermitted operating pressure 35 bar (PED 97/23/EC)

Nominal volume [l]

Eff. gas volume [l]

Weight [kg]

A max. [mm]

C [mm]

D [mm]

J thread ISO 228

SW [mm]

Q 1) [l/s]

20 19.8 43 108163

219 G 1/2 36

2032 35.0 56 159150 50.0 69 2091 78 68 2)

1) Q = max. flow rate of pressure fluid

2) Lock nut

Description ItemBladder assembly 1)consisting of: Bladder 2 Gas valve insert* 3 Lock nut 4 Seal cap 5 Valve protection cap 6 O-ring 7Seal kit consisting of: Gas valve insert* 3 O-ring 7 O-ring 8Repair kit 1)consisting of: Bladder assembly (see above) Seal kit (see above)* available separately1) When ordering, please state diameter of the smaller

shell port.Item 1 not available as a spare part.

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Bladder AccumulatorsHigh pressure

1. DESCRIPTION1.1. FUNCTIONFluids are practically incompressible and cannot therefore store pressure energy.The compressibility of a gas (nitrogen) is utilised in hydraulic accumulators for storing fluids. HYDAC bladder accumulators are based on this principle.A bladder accumulator consists of a fluid section and a gas section with the bladder acting as the gas-proof screen.The fluid around the bladder is connected to the hydraulic circuit so that the bladder accumulator draws in fluid when the pressure increases and the gas is compressed. When the pressure drops, the compressed gas expands and forces the stored fluid into the circuit.HYDAC bladder accumulators can be used in a wide variety of applications and are also available in different pressure ranges, see catalogue sections:

zBladder Accumulators Standard No. 3.201 zBladder Accumulators Low Pressure No. 3.202 zAccumulators No. 3.000

1.2. CONSTRUCTIONThe high pressure bladder accumulator consists of the pressure vessel, the flexible bladder with gas valve and the hydraulic connection with check valve.

1.2.1 Shell materialThe forged pressure vessel is seamless and manufactured from high tensile chrome molybdenum steel.

1.2.2 Bladder materialThe following elastomers are available as standard:


The material used depends on the particular operating medium and temperature.When choosing the elastomer, allowances must be made for the fact that the gas can cool down to below the permitted elastomer temperature if there are adverse discharge conditions (high pressure ratio p2/p0, high discharging velocity). This can cause cold cracking in the elastomer. The gas temperature can be calculated using the HYDAC Accumulator Simulation Program ASP.

1.2.3 Corrosion protectionFor operation with chemically aggressive media, the accumulator shell can be chemically nickel-plated internally or supplied with a special plastic coating, such as Duroplast.For external corrosion protection the accumulator can be supplied with an epoxy resin finish specially for offshore applications.

1.3. MOUNTING POSITION AND TYPE OF MOUNTING

Information on secure mounting positions and mounting elements can be found in the following catalogue sections:

zBladder Accumulators Standard No. 3.201 zSupports for Hydraulic Accumulators No. 3.502 zACCUSET SB No. 3.503

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2. TECHNICAL SPECIFICATIONS2.1. MODEL CODE (also order example)

SB690 - 32 A 1 / 312 U - 690 D Series

Nominal volume [l]

Fluid connectionA = standard connection

Gas side connection 1 = standard model 2) 9 = special model (example: 1/4" - BSP)

Material code 1)

Fluid connection 2 = high tensile steel 3 = stainless steel 6 = low temperature steel

Accumulator shell 0 = plastic coated (internally) 1 = carbon steel 2 = chemically nickel-plated (internal coating) 6 = low temperature steel 8 = plastic coated (e.g. Duroplast) internally and externally

Accumulator bladder 2 = NBR20 3 = ECO 4 = IIR (butyl) 5 = NBR21 (low temperature) 6 = FKM 7 = Others 9 = NBR22

Certificate code U = PED 97/23/EC

Permitted operating pressure [bar]

ConnectionA = Thread to ISO228 (1/2" BSP) D = Thread to ANSI B1.20.3 (1/2" NPTF)

Required gas pre-charge pressure must be stated separately!

2.2. EXPLANATORY NOTES2.2.1 Operating pressure690 bar (10000 psi) Higher pressures on request

2.2.2 Permitted working temperature and elastomer resistanceNBR20 -15 C ... +80 C water

water-glycol mineral oil

NBR21 -50 C ... +80 CNBR22 -30 C ... +80 CECO -30 C ... +120 C mineral oilIIR -40 C ... +100 C phosphate ester, waterFKM -10 C ... +150 C chlorinated hydrocarbons, petrol

1) Not all combinations are possible2) Gas valve in SB < 10 l = 7/8 - 14 UNF, in SB 10 l = M50x1.5

2.2.3 Gas chargingHydraulic accumulators must only be charged with nitrogen. Never use other gases. RISK OF EXPLOSION!In principle, the accumulator may only be charged with nitrogen class 4.5, filtered to < 3 m.If other gases are to be used, please contact HYDAC for advice.

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3. DIMENSIONS AND SPARE PARTS3.1. DRAWINGS3.1.1 Dimensions

3.2. DIMENSIONSNominal volume[l]

Eff. gas volume[l]

Weight

[kg]

A max.[mm]

B

[mm]

C

[mm]

D max.[mm]

E

[mm]

SW

[mm] 1 1.0 8.5 324

61 58 122 67 45 2.5 2.5 13.5 531 5 4.9 23 86013 12.0 92 700

77 68 250 110 7520 17.0 114 86532 33.5 186 138554 49.7 260 1900

3.3. SPARE PARTS3.3.1 Part numbers NBR

Nominal volume

Seal kit

Bladder assembly

Repair kit

Anti- extrusion ring

[l] P/N P/N P/N P/N

1

03182615

03010110 03182617

00293262 2.5 03211568 03201771

5 03211569 03201772

13

03182616

03211570 03211573

0302845520 03211592 03211574

32 03211571 03211585

54 03116598 03211586

Description ItemBladder assemblyconsisting of: Bladder 2 Gas valve insert 3 Lock nut 4 Seal cap 5 Valve protection cap 6 O-ring 7Seal kit consisting of: O-ring 7 Washer 15 O-ring 16 Vent screw 19 Support ring 23Repair kit consisting of: Seal kit (see above) Bladder assembly (see above) Anti-extrusion ring 14Item 1 not available as a spare part.

4. NOTEThe information in this brochure relates to the operating conditions and applications described. For applications and operating conditions not described, please contact the relevant technical department. Subject to technical modifications.

3.1.2 Spare parts

HYDAC Technology GmbH Industriegebiet D-66280 Sulzbach/Saar, GermanyTel.: +49 (0) 68 97 / 509 - 01 Fax: +49 (0) 68 97 / 509 - 464 Internet: www.hydac.com E-Mail: [email protected]

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Piston Accumulators

1. DESCRIPTION1.1. FUNCTIONFluids are practically incompressible and cannot therefore store pressure energy. The compressibility of a gas (nitrogen) is utilised in hydraulic accumulators for storing fluids. HYDAC piston accumulators are based on this principle. A piston accumulator consists of a fluid section and a gas section with the piston acting as the gas-proof screen. The gas section is pre-charged with nitrogen. The fluid section is connected to the hydraulic circuit so that the piston accumulator draws in fluid when the pressure increases and the gas is compressed. When the pressure drops, the compressed gas expands and forces the stored fluid into the circuit.

1.2. DESIGN

gas valve

end cap safety device

end cap

piston

sealing system

cylinder

external seal

end cap safety device

fluid connection

HYDAC piston accumulators consist of: zA cylinder with very finely machined internal surface. zEnd caps on the gas side and the oil side. Sealed with O-rings. zA floating steel or aluminium piston which can easily be accelerated due to its low weight. zA sealing system adapted to the particular application. The piston floats on two guide rings which prevent metal-to-metal contact between the piston and the accumulator wall. For use with certain aggressive or corrosive fluids, the parts coming into contact with the fluid can be nickel plated for protection, or made entirely from corrosion-resistant material. Suitable materials are also available for low temperature applications.

1.3. SEALING SYSTEMSPrecise information about operating conditions is required in order to select the most appropriate sealing system. Important criteria for this selection are, for example:

zDesign pressure, zEffective pressure differential, zSwitching frequency or cycles, z Temperature fluctuation, zOperating fluid, zCleanliness of fluid (micron rating of filter), zMaintenance requirements.

The sealing systems differ according to the type of piston used, each of which has its own type and arrangement of seals. The following elastomer sealing materials are available, depending on the operating conditions:

zNBR (acrylonitrile butadiene rubber, perbunan), z FKM (fluoro rubber, Viton), zPUR (polyurethane).

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Piston design type Application Degree of contamination in the fluid

Notes

1 z For general accumulator operation without special requirements

Optimized for applications with a high level of contamination

Application limitations:max. piston velocity: 0.5 m/s

2 z Low-friction design z For high piston speeds zSlow movements without stick-slip effect

Filtration: NAS 1638 - Class 6ISO 4406 - Class 17/15/12


3 z Low-friction design zSimple-to-fit seals zSlow movements without stick-slip effect

1 guide ring for pistons with 150 mm

2 guide rings for pistons 180 mm


4 z Low-friction design with emergency safety features zSlow movements without stick-slip effect zVery low oil transfer to the gas side

Application limitations:max. piston velocity: 5 m/s

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1.6. TECHNICAL REQUIREMENTS

HYDAC piston accumulators are suitable for high flow rates. With the largest piston accumulator diameter made to date of 800 mm, a flow rate of 1000 l/s can be achieved at a piston velocity of 2 m/s.

1.6.1 Effect of sealing frictionThe permitted piston velocity depends on the sealing friction. Higher piston velocities are possible where there is less sealing friction.HYDAC piston accumulators of piston design type 2 allow velocities of up to 3.5 m/s.

1.6.2 Permitted velocitiesGas velocity The flow velocities in the gas connection and pipe system should be limited to 30 m/s when using piston accumulators of the back-up type. Gas velocities of over 50 m/s should be avoided at all costs.Oil velocity In order to limit the pressure losses when the operating fluid is displaced, the flow velocity should not exceed 10 m/s in the adapter cross-section.

1.6.3 Function tests and fatigue tests Function tests and fatigue tests are carried out to ensure the development and continuous improvement of our piston accumulators. By subjecting the accumulators to endurance tests under realistic as well as extreme working conditions, important data can be obtained about the long-term behaviour of the components. In the case of piston accumulators, important information on gas density and the life expectancy of seals is gained from such tests. Vital data for use in accumulator sizing is gained by altering the working pressure and switching cycles.

1.6.4 FluidsThe following sealing materials are suitable for the fluids listed below:NBR, resistant to:

zmineral oils (HL and HLP) z fire-resistant fluids from the groups HFA, HFB and HFC zwater and seawater up to approx. 100 C

NBR, not resistant to: z aromatic hydrocarbons z chlorinated hydrocarbons z amines and ketones z hydraulic fluids of type HFD

FPM, resistant to: zmineral oils (HL and HLP) z hydraulic fluids of type HFD z fuels as well as aromatic and chlorinated hydrocarbons z inorganic acids (but not all, please contact our technical department)

FPM, not resistant to: z ketones and amines z (anhydrous) ammonia z organic acids such as formic acid and acetic acid

PUR, resistant to: zmineral oils (HL and HLP) z non-flam fluids from the HFA group

PUR, not resistant to: zwater and water-glycol mixtures z alkalis z acids

1.6.5 Temperature ranges of the sealsMaterial HYDAC Temp. range abbrev. code long-termNBR 2 -20 C ... + 80 CFPM 6 -15 C ... +160 CPUR 8 -30 C ... + 80 CFor temperatures outside these ranges, please contact our technical department for more information. There are also special grades available depending on the application.

1.6.6 Gas chargingHydraulic accumulators must only be charged with nitrogen. Never use other gases. RISK OF EXPLOSION!In principle accumulators may only be charged with nitrogen class 4.5, filtered to < 3 m. If other gases are to be used, please contact HYDAC for advice.

1.4. MOUNTING POSITIONHYDAC piston accumulators operate in any position. Vertical installation is preferable with the gas-side at the top, to prevent contamination from the fluid settling on the piston seals. For accumulators with certain piston position indicators vertical installation is essential (see 1.7.). Piston accumulators with a piston diameter 355 mm must only be mounted vertically.

1.5. ADVANTAGES OF HYDAC PISTON ACCUMULATORS

z complete range from 0.1 ... 1200 I nominal volume, z high ratios possible between pre-charge pressure and max. working pressure, z economic solution using back-up gas bottles for low pressure differentials, z high flow rates possible; limitation: max. piston velocity, z power savings, z high level of efficiency of the hydraulic installation, z gas-tight and leakage free, z no sudden discharge when seals are worn, z requires little space, zmonitoring of the volume across the entire piston stroke or electrical limit switch.

Further advantages of using the low-friction sealing system:

zminimum friction, z also suitable for low pressure differentials, z no start-up friction, z no stick-slip, z low noise, no vibration, z high piston velocity up to 5 m/s for piston type 4, z improved accumulator efficiency, z good life expectancy of seals because of low wear, z suitable for large temperature fluctuations, z low maintenance requirement.

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The electrical limit switch usually monitors the max. charged condition of the piston accumulator. It can, however, also permit control functions of the attached hydraulics to be carried out over a certain stroke length.The limit switch consists of the switching rod with a permanent solenoid which is not attached to the the piston and can only achieve a limited stroke, and an anti-magnetic housing and two or more switches.These switches can be normally closed or normally open or bistable. An N/C or N/O and a bistable switch cannot be fitted simultaneously to a limit switch. Our standard limit switch is fitted with a N/C and a N/O switch.On another model, switching is carried out by inductive proximity switches.The switch is reset by a spring or the force of gravity. Vertical installation is preferable, due to the friction and possible wear and tear in the rod guide. For limit switches with a stroke of > 200 mm, vertical mounting with the gas side at the top is essential. The maximum piston velocity must not exceed 0.5 m/s over the stroke range of the limit switch.

1.7. PISTON POSITION INDICATORS

1.7.2 Protruding piston rod

The protruding piston rod permits the position of the piston to be monitored over the whole stroke. It consists of the piston rod, which is fixed to the piston and sealed in, and what is known as the trip cam which actuates the limit switches.The position of the piston can be monitored at any point using the trip cam. This facility is used mainly to switch the pump on and off.Normally the piston rod protrudes from the accumulator on the fluid side to avoid possible points of leakage on the gas side. On the protruding piston rod version, the hydraulic connection will be on the side if the size of the end cap does not permit otherwise.The protruding piston rod functions in any mounting position. There must however be sufficient space available for the protruding piston rod to move in and out. The maximum piston velocity should not exceed 0.5 m/s.

1.7.3 Ultrasonic distance measurement

The piston position is determined by ultrasonic measurement.It is only possible to take the measurements from the fluid side because a continuous sound carrier medium is required for ultrasound. In order to eliminate false readings, the fluid must be as free of air bubbles as possible. The piston should be mounted such that no air can co

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